Drop remainders of identity API v2.0 references

keystone has dropped the v2.0 API in queens, time to drop all special
casing for it.

Change-Id: If628c4627f7c8b8c2ee9bca16ea6db693cf8526a
diff --git a/openrc b/openrc
index e20a5a5..5ec7634 100644
--- a/openrc
+++ b/openrc
@@ -55,27 +55,14 @@
     GLANCE_HOST=${GLANCE_HOST:-$HOST_IP}
 fi
 
-# Identity API version
-export OS_IDENTITY_API_VERSION=3
-
-# Authenticating against an OpenStack cloud using Keystone returns a **Token**
-# and **Service Catalog**.  The catalog contains the endpoints for all services
-# the user/project has access to - including nova, glance, keystone, swift, ...
-# We currently recommend using the version 3 *identity api*.
-#
-
 # If you don't have a working .stackenv, this is the backup position
 KEYSTONE_BACKUP=$SERVICE_PROTOCOL://$SERVICE_HOST:5000
 KEYSTONE_SERVICE_URI=${KEYSTONE_SERVICE_URI:-$KEYSTONE_BACKUP}
 
 export OS_AUTH_URL=${OS_AUTH_URL:-$KEYSTONE_SERVICE_URI}
 
-# Currently, in order to use openstackclient with Identity API v3,
-# we need to set the domain which the user and project belong to.
-if [ "$OS_IDENTITY_API_VERSION" = "3" ]; then
-    export OS_USER_DOMAIN_ID=${OS_USER_DOMAIN_ID:-"default"}
-    export OS_PROJECT_DOMAIN_ID=${OS_PROJECT_DOMAIN_ID:-"default"}
-fi
+export OS_USER_DOMAIN_ID=${OS_USER_DOMAIN_ID:-"default"}
+export OS_PROJECT_DOMAIN_ID=${OS_PROJECT_DOMAIN_ID:-"default"}
 
 # Set OS_CACERT to a default CA certificate chain if it exists.
 if [[ ! -v OS_CACERT ]] ; then